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The combined effects of North Atlantic Oscillation and Western Pacific teleconnection on winter temperature in Eastern Asia during 1980–2021
Acta Oceanologica Sinica ( IF 1.4 ) Pub Date : 2024-01-09 , DOI: 10.1007/s13131-023-2187-6
Ziqun Zhang , Hongyan Cui , Baoxu Chen , Hong Cai , Pin Li

As important atmospheric circulation patterns in Northern Hemisphere (NH), the North Atlantic Oscillation (NAO) and the Western Pacific teleconnection (WP) affect the winter climate in Eurasia. In order to explore the combined effects of NAO and WP on East Asian (EA) temperature, the NAO and WP indices are divided into four phases from 1980–2021: the positive NAO and WP phase (NAO+/WP+), the negative NAO and WP phase (NAO−/WP−), the positive NAO and negative WP phase (NAO+/WP−), the negative NAO and positive WP phase (NAO−/WP+). In the phase of NAO+/WP+, the low geopotential height (GH) stays in north of EA at 50°–80°N; the surface air temperature anomaly (SATA) is 0.8–1 °C lower than Southern Asian. In the phase of NAO−/WP−, the center of high temperature and GH locate in the northeast of EA; the cold air spreads to Southern Asia, causing the SATA decreases 1–1.5 °C. In the phase of NAO+/WP−, the high GH belt is formed at 55°–80°N. Meanwhile, the center of high SATA locates in the north of Asia that increases 0.8–1.1 °C. The cold airflow causes temperature dropping 0.5–1 °C in the south of EA. The SATA improves 0.5–1.5 °C in south of EA in the phase of NAO−/WP+. The belt of high GH is formed at 25°–50°N, and blocks the cold air which from Siberia. The NAO and WP generate two warped plate pressure structures in NH, and affect the temperature by different pressure configurations. NAO and WP form different GH, and GH acts to block and push airflow by affecting the air pressure, then causes the temperature to be different from the north and south of EA. Finally, the multiple linear regression result shows that NAO and WP are weakened by each other such as the phase of NAO+/WP+ and NAO−/WP−.



中文翻译:

1980-2021年北大西洋涛动和西太平洋遥相关对东亚冬季气温的综合影响

作为北半球(NH)重要的大气环流模式,北大西洋涛动(NAO)和西太平洋遥相关(WP)影响着欧亚大陆的冬季气候。为了探讨NAO和WP对东亚气温的综合影响,将1980-2021年NAO和WP指数分为四个阶段:正NAO和WP阶段(NAO+/WP+)、负NAO和WP阶段。 WP 相 (NAO−/WP−)、正 NAO 和负 WP 相 (NAO+/WP−)、负 NAO 和正 WP 相 (NAO−/WP+)。NAO+/WP+阶段,低位势高度(GH)停留在EA以北50°~80°N;地表气温距平 (SATA) 比南亚低 0.8–1 °C。NAO−/WP−阶段,高温中心和GH中心位于EA东北部;冷空气向南亚扩散,导致SATA下降1~1.5℃。在NAO+/WP−阶段,高GH带形成于55°~80°N。同时,SATA高温中心位于亚洲北部,升高0.8~1.1℃。冷气流导致 EA 南部气温下降 0.5–1 °C。在 NAO−/WP+ 阶段,SATA 使 EA 南部的温度提高了 0.5–1.5 °C。高GH带形成于北纬25°~50°,阻挡来自西伯利亚的冷空气。NAO和WP在NH中产生两种翘曲的板压力结构,并通过不同的压力配置影响温度。NAO和WP形成不同的GH,GH通过影响气压来阻挡和推动气流,从而导致EA南北温度不同。最后,多元线性回归结果显示NAO和WP相互削弱,例如NAO+/WP+和NAO−/WP−的相位。

更新日期:2024-01-09
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